Publish/Unpublish Network Containers via CNS (#430)

Expose 2 APIs to publish and unpublish network containers from CNS.
a. PublishNetworkContainer
b. UnpublishNetworkContainer

DNC calls CNS to publish and unpublish the network containers.

Author: ashvindeodhar

Makefile

@@ -42,6 +42,7 @@ CNSFILES = \
 	$(wildcard cns/imdsclient/*.go) \
 	$(wildcard cns/ipamclient/*.go) \
 	$(wildcard cns/hnsclient/*.go) \
+	$(wildcard cns/nmagentclient/*.go) \
 	$(wildcard cns/restserver/*.go) \
 	$(wildcard cns/routes/*.go) \
 	$(wildcard cns/service/*.go) \

cns/NetworkContainerContract.go

@@ -1,13 +1,17 @@
 package cns
 
-import "encoding/json"
+import (
+	"encoding/json"
+)
 
 // Container Network Service DNC Contract
 const (
 	SetOrchestratorType                      = "/network/setorchestratortype"
 	CreateOrUpdateNetworkContainer           = "/network/createorupdatenetworkcontainer"
 	DeleteNetworkContainer                   = "/network/deletenetworkcontainer"
 	GetNetworkContainerStatus                = "/network/getnetworkcontainerstatus"
+	PublishNetworkContainer                  = "/network/publishnetworkcontainer"
+	UnpublishNetworkContainer                = "/network/unpublishnetworkcontainer"
 	GetInterfaceForContainer                 = "/network/getinterfaceforcontainer"
 	GetNetworkContainerByOrchestratorContext = "/network/getnetworkcontainerbyorchestratorcontext"
 	AttachContainerToNetwork                 = "/network/attachcontainertonetwork"
@@ -182,3 +186,36 @@ type NetworkInterface struct {
 	Name      string
 	IPAddress string
 }
+
+// PublishNetworkContainerRequest specifies request to publish network container via NMAgent.
+type PublishNetworkContainerRequest struct {
+	NetworkID                         string
+	NetworkContainerID                string
+	JoinNetworkURL                    string
+	CreateNetworkContainerURL         string
+	CreateNetworkContainerRequestBody []byte
+}
+
+// PublishNetworkContainerResponse specifies the response to publish network container request.
+type PublishNetworkContainerResponse struct {
+	Response            Response
+	PublishErrorStr     string
+	PublishStatusCode   int
+	PublishResponseBody []byte
+}
+
+// UnpublishNetworkContainerRequest specifies request to unpublish network container via NMAgent.
+type UnpublishNetworkContainerRequest struct {
+	NetworkID                 string
+	NetworkContainerID        string
+	JoinNetworkURL            string
+	DeleteNetworkContainerURL string
+}
+
+// UnpublishNetworkContainerResponse specifies the response to unpublish network container request.
+type UnpublishNetworkContainerResponse struct {
+	Response              Response
+	UnpublishErrorStr     string
+	UnpublishStatusCode   int
+	UnpublishResponseBody []byte
+}

cns/nmagentclient/nmagentclient.go

@@ -0,0 +1,64 @@
+package nmagentclient
+
+import (
+	"bytes"
+	"encoding/json"
+	"net/http"
+
+	"github.com/Azure/azure-container-networking/common"
+	"github.com/Azure/azure-container-networking/log"
+)
+
+// JoinNetwork joins the given network
+func JoinNetwork(
+	networkID string,
+	joinNetworkURL string) (*http.Response, error) {
+	log.Printf("[NMAgentClient] JoinNetwork: %s", networkID)
+
+	// Empty body is required as wireserver cannot handle a post without the body.
+	var body bytes.Buffer
+	json.NewEncoder(&body).Encode("")
+	response, err := common.GetHttpClient().Post(joinNetworkURL, "application/json", &body)
+
+	if err == nil && response.StatusCode == http.StatusOK {
+		defer response.Body.Close()
+	}
+
+	log.Printf("[NMAgentClient][Response] Join network: %s. Response: %+v. Error: %v",
+		networkID, response, err)
+
+	return response, err
+}
+
+// PublishNetworkContainer publishes given network container
+func PublishNetworkContainer(
+	networkContainerID string,
+	createNetworkContainerURL string,
+	requestBodyData []byte) (*http.Response, error) {
+	log.Printf("[NMAgentClient] PublishNetworkContainer NC: %s", networkContainerID)
+
+	requestBody := bytes.NewBuffer(requestBodyData)
+	response, err := common.GetHttpClient().Post(createNetworkContainerURL, "application/json", requestBody)
+
+	log.Printf("[NMAgentClient][Response] Publish NC: %s. Response: %+v. Error: %v",
+		networkContainerID, response, err)
+
+	return response, err
+}
+
+// UnpublishNetworkContainer unpublishes given network container
+func UnpublishNetworkContainer(
+	networkContainerID string,
+	deleteNetworkContainerURL string) (*http.Response, error) {
+	log.Printf("[NMAgentClient] UnpublishNetworkContainer NC: %s", networkContainerID)
+
+	// Empty body is required as wireserver cannot handle a post without the body.
+	var body bytes.Buffer
+	json.NewEncoder(&body).Encode("")
+	response, err := common.GetHttpClient().Post(deleteNetworkContainerURL, "application/json", &body)
+
+	log.Printf("[NMAgentClient][Response] Unpublish NC: %s. Response: %+v. Error: %v",
+		networkContainerID, response, err)
+
+	return response, err
+}

cns/restserver/api.go

@@ -24,6 +24,9 @@ const (
 	UnsupportedVerb                 = 21
 	UnsupportedNetworkContainerType = 22
 	InvalidRequest                  = 23
+	NetworkJoinFailed               = 24
+	NetworkContainerPublishFailed   = 25
+	NetworkContainerUnpublishFailed = 26
 	UnexpectedError                 = 99
 )